source3/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25
  26 static_decl_rpc;
  27
  28 static int am_parent = 1;
  29
  30 extern struct auth_context *negprot_global_auth_context;
  31 extern SIG_ATOMIC_T got_sig_term;
  32 extern SIG_ATOMIC_T reload_after_sighup;
  33 static SIG_ATOMIC_T got_sig_cld;
  34
  35 #ifdef WITH_DFS
  36 extern int dcelogin_atmost_once;
  37 #endif /* WITH_DFS */
  38
  39 /* really we should have a top level context structure that has the
  40    client file descriptor as an element. That would require a major rewrite :(
  41
  42    the following 2 functions are an alternative - they make the file
  43    descriptor private to smbd
  44  */
  45 static int server_fd = -1;
  46
  47 int smbd_server_fd(void)
  48 {
  49         return server_fd;
  50 }
  51
  52 static void smbd_set_server_fd(int fd)
  53 {
  54         server_fd = fd;
  55 }
  56
  57 int get_client_fd(void)
  58 {
  59         return server_fd;
  60 }
  61
  62 struct event_context *smbd_event_context(void)
  63 {
  64         static struct event_context *ctx;
  65
  66         if (!ctx && !(ctx = event_context_init(NULL))) {
  67                 smb_panic("Could not init smbd event context");
  68         }
  69         return ctx;
  70 }
  71
  72 struct messaging_context *smbd_messaging_context(void)
  73 {
  74         static struct messaging_context *ctx;
  75
  76         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  77                                            smbd_event_context()))) {
  78                 smb_panic("Could not init smbd messaging context");
  79         }
  80         return ctx;
  81 }
  82
  83 struct memcache *smbd_memcache(void)
  84 {
  85         static struct memcache *cache;
  86
  87         if (!cache
  88             && !(cache = memcache_init(NULL,
  89                                        lp_max_stat_cache_size()*1024))) {
  90
  91                 smb_panic("Could not init smbd memcache");
  92         }
  93         return cache;
  94 }
  95
  96 /*******************************************************************
  97  What to do when smb.conf is updated.
  98  ********************************************************************/
  99
 100 static void smb_conf_updated(struct messaging_context *msg,
 101                              void *private_data,
 102                              uint32_t msg_type,
 103                              struct server_id server_id,
 104                              DATA_BLOB *data)
 105 {
 106         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 107                   "updated. Reloading.\n"));
 108         reload_services(False);
 109 }
 110
 111
 112 /*******************************************************************
 113  Delete a statcache entry.
 114  ********************************************************************/
 115
 116 static void smb_stat_cache_delete(struct messaging_context *msg,
 117                                   void *private_data,
 118                                   uint32_t msg_tnype,
 119                                   struct server_id server_id,
 120                                   DATA_BLOB *data)
 121 {
 122         const char *name = (const char *)data->data;
 123         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 124         stat_cache_delete(name);
 125 }
 126
 127 /****************************************************************************
 128  Terminate signal.
 129 ****************************************************************************/
 130
 131 static void sig_term(void)
 132 {
 133         got_sig_term = 1;
 134         sys_select_signal(SIGTERM);
 135 }
 136
 137 /****************************************************************************
 138  Catch a sighup.
 139 ****************************************************************************/
 140
 141 static void sig_hup(int sig)
 142 {
 143         reload_after_sighup = 1;
 144         sys_select_signal(SIGHUP);
 145 }
 146
 147 /****************************************************************************
 148  Catch a sigcld
 149 ****************************************************************************/
 150 static void sig_cld(int sig)
 151 {
 152         got_sig_cld = 1;
 153         sys_select_signal(SIGCLD);
 154 }
 155
 156 /****************************************************************************
 157   Send a SIGTERM to our process group.
 158 *****************************************************************************/
 159
 160 static void  killkids(void)
 161 {
 162         if(am_parent) kill(0,SIGTERM);
 163 }
 164
 165 /****************************************************************************
 166  Process a sam sync message - not sure whether to do this here or
 167  somewhere else.
 168 ****************************************************************************/
 169
 170 static void msg_sam_sync(struct messaging_context *msg,
 171                          void *private_data,
 172                          uint32_t msg_type,
 173                          struct server_id server_id,
 174                          DATA_BLOB *data)
 175 {
 176         DEBUG(10, ("** sam sync message received, ignoring\n"));
 177 }
 178
 179
 180 /****************************************************************************
 181  Open the socket communication - inetd.
 182 ****************************************************************************/
 183
 184 static bool open_sockets_inetd(void)
 185 {
 186         /* Started from inetd. fd 0 is the socket. */
 187         /* We will abort gracefully when the client or remote system
 188            goes away */
 189         smbd_set_server_fd(dup(0));
 190
 191         /* close our standard file descriptors */
 192         close_low_fds(False); /* Don't close stderr */
 193
 194         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 195         set_socket_options(smbd_server_fd(), lp_socket_options());
 196
 197         return True;
 198 }
 199
 200 static void msg_exit_server(struct messaging_context *msg,
 201                             void *private_data,
 202                             uint32_t msg_type,
 203                             struct server_id server_id,
 204                             DATA_BLOB *data)
 205 {
 206         DEBUG(3, ("got a SHUTDOWN message\n"));
 207         exit_server_cleanly(NULL);
 208 }
 209
 210 #ifdef DEVELOPER
 211 static void msg_inject_fault(struct messaging_context *msg,
 212                              void *private_data,
 213                              uint32_t msg_type,
 214                              struct server_id src,
 215                              DATA_BLOB *data)
 216 {
 217         int sig;
 218
 219         if (data->length != sizeof(sig)) {
 220
 221                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 222                           procid_str_static(&src)));
 223                 return;
 224         }
 225
 226         sig = *(int *)data->data;
 227         if (sig == -1) {
 228                 exit_server("internal error injected");
 229                 return;
 230         }
 231
 232 #if HAVE_STRSIGNAL
 233         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 234                   procid_str_static(&src), sig, strsignal(sig)));
 235 #else
 236         DEBUG(0, ("Process %s requested injection of signal %d\n",
 237                   procid_str_static(&src), sig));
 238 #endif
 239
 240         kill(sys_getpid(), sig);
 241 }
 242 #endif /* DEVELOPER */
 243
 244 struct child_pid {
 245         struct child_pid *prev, *next;
 246         pid_t pid;
 247 };
 248
 249 static struct child_pid *children;
 250 static int num_children;
 251
 252 static void add_child_pid(pid_t pid)
 253 {
 254         struct child_pid *child;
 255
 256         if (lp_max_smbd_processes() == 0) {
 257                 /* Don't bother with the child list if we don't care anyway */
 258                 return;
 259         }
 260
 261         child = SMB_MALLOC_P(struct child_pid);
 262         if (child == NULL) {
 263                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 264                 return;
 265         }
 266         child->pid = pid;
 267         DLIST_ADD(children, child);
 268         num_children += 1;
 269 }
 270
 271 static void remove_child_pid(pid_t pid)
 272 {
 273         struct child_pid *child;
 274
 275         if (lp_max_smbd_processes() == 0) {
 276                 /* Don't bother with the child list if we don't care anyway */
 277                 return;
 278         }
 279
 280         for (child = children; child != NULL; child = child->next) {
 281                 if (child->pid == pid) {
 282                         struct child_pid *tmp = child;
 283                         DLIST_REMOVE(children, child);
 284                         SAFE_FREE(tmp);
 285                         num_children -= 1;
 286                         return;
 287                 }
 288         }
 289
 290         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 291 }
 292
 293 /****************************************************************************
 294  Have we reached the process limit ?
 295 ****************************************************************************/
 296
 297 static bool allowable_number_of_smbd_processes(void)
 298 {
 299         int max_processes = lp_max_smbd_processes();
 300
 301         if (!max_processes)
 302                 return True;
 303
 304         return num_children < max_processes;
 305 }
 306
 307 /****************************************************************************
 308  Open the socket communication.
 309 ****************************************************************************/
 310
 311 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 312 {
 313         int num_interfaces = iface_count();
 314         int num_sockets = 0;
 315         int fd_listenset[FD_SETSIZE];
 316         fd_set listen_set;
 317         int s;
 318         int maxfd = 0;
 319         int i;
 320         char *ports;
 321         struct dns_reg_state * dns_reg = NULL;
 322         unsigned dns_port = 0;
 323
 324         if (!is_daemon) {
 325                 return open_sockets_inetd();
 326         }
 327
 328 #ifdef HAVE_ATEXIT
 329         {
 330                 static int atexit_set;
 331                 if(atexit_set == 0) {
 332                         atexit_set=1;
 333                         atexit(killkids);
 334                 }
 335         }
 336 #endif
 337
 338         /* Stop zombies */
 339         CatchSignal(SIGCLD, sig_cld);
 340
 341         FD_ZERO(&listen_set);
 342
 343         /* use a reasonable default set of ports - listing on 445 and 139 */
 344         if (!smb_ports) {
 345                 ports = lp_smb_ports();
 346                 if (!ports || !*ports) {
 347                         ports = smb_xstrdup(SMB_PORTS);
 348                 } else {
 349                         ports = smb_xstrdup(ports);
 350                 }
 351         } else {
 352                 ports = smb_xstrdup(smb_ports);
 353         }
 354
 355         if (lp_interfaces() && lp_bind_interfaces_only()) {
 356                 /* We have been given an interfaces line, and been
 357                    told to only bind to those interfaces. Create a
 358                    socket per interface and bind to only these.
 359                 */
 360
 361                 /* Now open a listen socket for each of the
 362                    interfaces. */
 363                 for(i = 0; i < num_interfaces; i++) {
 364                         TALLOC_CTX *frame = NULL;
 365                         const struct sockaddr_storage *ifss =
 366                                         iface_n_sockaddr_storage(i);
 367                         char *tok;
 368                         const char *ptr;
 369
 370                         if (ifss == NULL) {
 371                                 DEBUG(0,("open_sockets_smbd: "
 372                                         "interface %d has NULL IP address !\n",
 373                                         i));
 374                                 continue;
 375                         }
 376
 377                         frame = talloc_stackframe();
 378                         for (ptr=ports;
 379                                         next_token_talloc(frame,&ptr, &tok, " \t,");) {
 380                                 unsigned port = atoi(tok);
 381                                 if (port == 0 || port > 0xffff) {
 382                                         continue;
 383                                 }
 384
 385                                 /* Keep the first port for mDNS service
 386                                  * registration.
 387                                  */
 388                                 if (dns_port == 0) {
 389                                         dns_port = port;
 390                                 }
 391
 392                                 s = fd_listenset[num_sockets] =
 393                                         open_socket_in(SOCK_STREAM, port, 0,
 394                                                         ifss, True);
 395                                 if(s == -1) {
 396                                         continue;
 397                                 }
 398
 399                                 /* ready to listen */
 400                                 set_socket_options(s,"SO_KEEPALIVE");
 401                                 set_socket_options(s,lp_socket_options());
 402
 403                                 /* Set server socket to
 404                                  * non-blocking for the accept. */
 405                                 set_blocking(s,False);
 406
 407                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 408                                         DEBUG(0,("open_sockets_smbd: listen: "
 409                                                 "%s\n", strerror(errno)));
 410                                         close(s);
 411                                         TALLOC_FREE(frame);
 412                                         return False;
 413                                 }
 414                                 FD_SET(s,&listen_set);
 415                                 maxfd = MAX( maxfd, s);
 416
 417                                 num_sockets++;
 418                                 if (num_sockets >= FD_SETSIZE) {
 419                                         DEBUG(0,("open_sockets_smbd: Too "
 420                                                 "many sockets to bind to\n"));
 421                                         TALLOC_FREE(frame);
 422                                         return False;
 423                                 }
 424                         }
 425                         TALLOC_FREE(frame);
 426                 }
 427         } else {
 428                 /* Just bind to 0.0.0.0 - accept connections
 429                    from anywhere. */
 430
 431                 TALLOC_CTX *frame = talloc_stackframe();
 432                 char *tok;
 433                 const char *ptr;
 434                 const char *sock_addr = lp_socket_address();
 435                 char *sock_tok;
 436                 const char *sock_ptr;
 437
 438                 if (strequal(sock_addr, "0.0.0.0") ||
 439                                 strequal(sock_addr, "::")) {
 440 #if HAVE_IPV6
 441                         sock_addr = "::,0.0.0.0";
 442 #else
 443                         sock_addr = "0.0.0.0";
 444 #endif
 445                 }
 446
 447                 for (sock_ptr=sock_addr;
 448                                 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
 449                         for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
 450                                 struct sockaddr_storage ss;
 451
 452                                 unsigned port = atoi(tok);
 453                                 if (port == 0 || port > 0xffff) {
 454                                         continue;
 455                                 }
 456
 457                                 /* Keep the first port for mDNS service
 458                                  * registration.
 459                                  */
 460                                 if (dns_port == 0) {
 461                                         dns_port = port;
 462                                 }
 463
 464                                 /* open an incoming socket */
 465                                 if (!interpret_string_addr(&ss, sock_tok,
 466                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 467                                         continue;
 468                                 }
 469
 470                                 s = open_socket_in(SOCK_STREAM, port, 0,
 471                                                    &ss, true);
 472                                 if (s == -1) {
 473                                         continue;
 474                                 }
 475
 476                                 /* ready to listen */
 477                                 set_socket_options(s,"SO_KEEPALIVE");
 478                                 set_socket_options(s,lp_socket_options());
 479
 480                                 /* Set server socket to non-blocking
 481                                  * for the accept. */
 482                                 set_blocking(s,False);
 483
 484                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 485                                         DEBUG(0,("open_sockets_smbd: "
 486                                                 "listen: %s\n",
 487                                                  strerror(errno)));
 488                                         close(s);
 489                                         TALLOC_FREE(frame);
 490                                         return False;
 491                                 }
 492
 493                                 fd_listenset[num_sockets] = s;
 494                                 FD_SET(s,&listen_set);
 495                                 maxfd = MAX( maxfd, s);
 496
 497                                 num_sockets++;
 498
 499                                 if (num_sockets >= FD_SETSIZE) {
 500                                         DEBUG(0,("open_sockets_smbd: Too "
 501                                                 "many sockets to bind to\n"));
 502                                         TALLOC_FREE(frame);
 503                                         return False;
 504                                 }
 505                         }
 506                 }
 507                 TALLOC_FREE(frame);
 508         }
 509
 510         SAFE_FREE(ports);
 511
 512         if (num_sockets == 0) {
 513                 DEBUG(0,("open_sockets_smbd: No "
 514                         "sockets available to bind to.\n"));
 515                 return false;
 516         }
 517
 518         /* Setup the main smbd so that we can get messages. Note that
 519            do this after starting listening. This is needed as when in
 520            clustered mode, ctdb won't allow us to start doing database
 521            operations until it has gone thru a full startup, which
 522            includes checking to see that smbd is listening. */
 523         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
 524
 525         /* Listen to messages */
 526
 527         messaging_register(smbd_messaging_context(), NULL,
 528                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 529         messaging_register(smbd_messaging_context(), NULL,
 530                            MSG_SHUTDOWN, msg_exit_server);
 531         messaging_register(smbd_messaging_context(), NULL,
 532                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 533         messaging_register(smbd_messaging_context(), NULL,
 534                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 535         messaging_register(smbd_messaging_context(), NULL,
 536                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 537         brl_register_msgs(smbd_messaging_context());
 538
 539 #ifdef DEVELOPER
 540         messaging_register(smbd_messaging_context(), NULL,
 541                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 542 #endif
 543
 544         /* now accept incoming connections - forking a new process
 545            for each incoming connection */
 546         DEBUG(2,("waiting for a connection\n"));
 547         while (1) {
 548                 struct timeval now, idle_timeout;
 549                 fd_set r_fds, w_fds;
 550                 int num;
 551
 552                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 553                 message_dispatch(smbd_messaging_context());
 554
 555                 if (got_sig_cld) {
 556                         pid_t pid;
 557                         got_sig_cld = False;
 558
 559                         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 560                                 remove_child_pid(pid);
 561                         }
 562                 }
 563
 564                 idle_timeout = timeval_zero();
 565
 566                 memcpy((char *)&r_fds, (char *)&listen_set,
 567                        sizeof(listen_set));
 568                 FD_ZERO(&w_fds);
 569                 GetTimeOfDay(&now);
 570
 571                 /* Kick off our mDNS registration. */
 572                 if (dns_port != 0) {
 573                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 574                                         &r_fds, &idle_timeout);
 575                 }
 576
 577                 event_add_to_select_args(smbd_event_context(), &now,
 578                                          &r_fds, &w_fds, &idle_timeout,
 579                                          &maxfd);
 580
 581                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 582                                  timeval_is_zero(&idle_timeout) ?
 583                                  NULL : &idle_timeout);
 584
 585                 if (num == -1 && errno == EINTR) {
 586                         if (got_sig_term) {
 587                                 exit_server_cleanly(NULL);
 588                         }
 589
 590                         /* check for sighup processing */
 591                         if (reload_after_sighup) {
 592                                 change_to_root_user();
 593                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 594                                 reload_services(False);
 595                                 reload_after_sighup = 0;
 596                         }
 597
 598                         continue;
 599                 }
 600
 601                 /* process pending nDNS responses */
 602                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 603                         --num;
 604                 }
 605
 606                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 607                         continue;
 608                 }
 609
 610                 /* check if we need to reload services */
 611                 check_reload(time(NULL));
 612
 613                 /* Find the sockets that are read-ready -
 614                    accept on these. */
 615                 for( ; num > 0; num--) {
 616                         struct sockaddr addr;
 617                         socklen_t in_addrlen = sizeof(addr);
 618                         pid_t child = 0;
 619
 620                         s = -1;
 621                         for(i = 0; i < num_sockets; i++) {
 622                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 623                                         s = fd_listenset[i];
 624                                         /* Clear this so we don't look
 625                                            at it again. */
 626                                         FD_CLR(fd_listenset[i],&r_fds);
 627                                         break;
 628                                 }
 629                         }
 630
 631                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 632
 633                         if (smbd_server_fd() == -1 && errno == EINTR)
 634                                 continue;
 635
 636                         if (smbd_server_fd() == -1) {
 637                                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 638                                          strerror(errno)));
 639                                 continue;
 640                         }
 641
 642                         /* Ensure child is set to blocking mode */
 643                         set_blocking(smbd_server_fd(),True);
 644
 645                         if (smbd_server_fd() != -1 && interactive)
 646                                 return True;
 647
 648                         if (allowable_number_of_smbd_processes() &&
 649                             smbd_server_fd() != -1 &&
 650                             ((child = sys_fork())==0)) {
 651                                 char remaddr[INET6_ADDRSTRLEN];
 652
 653                                 /* Child code ... */
 654
 655                                 /* Stop zombies, the parent explicitly handles
 656                                  * them, counting worker smbds. */
 657                                 CatchChild();
 658
 659                                 /* close the listening socket(s) */
 660                                 for(i = 0; i < num_sockets; i++)
 661                                         close(fd_listenset[i]);
 662
 663                                 /* close our mDNS daemon handle */
 664                                 dns_register_close(&dns_reg);
 665
 666                                 /* close our standard file
 667                                    descriptors */
 668                                 close_low_fds(False);
 669                                 am_parent = 0;
 670
 671                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 672                                 set_socket_options(smbd_server_fd(),
 673                                                    lp_socket_options());
 674
 675                                 /* this is needed so that we get decent entries
 676                                    in smbstatus for port 445 connects */
 677                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 678                                                                 remaddr,
 679                                                                 sizeof(remaddr)),
 680                                                                 false);
 681
 682                                 /* Reset the state of the random
 683                                  * number generation system, so
 684                                  * children do not get the same random
 685                                  * numbers as each other */
 686
 687                                 set_need_random_reseed();
 688                                 /* tdb needs special fork handling - remove
 689                                  * CLEAR_IF_FIRST flags */
 690                                 if (tdb_reopen_all(1) == -1) {
 691                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 692                                         smb_panic("tdb_reopen_all failed");
 693                                 }
 694
 695                                 return True;
 696                         }
 697                         /* The parent doesn't need this socket */
 698                         close(smbd_server_fd());
 699
 700                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 701                                 Clear the closed fd info out of server_fd --
 702                                 and more importantly, out of client_fd in
 703                                 util_sock.c, to avoid a possible
 704                                 getpeername failure if we reopen the logs
 705                                 and use %I in the filename.
 706                         */
 707
 708                         smbd_set_server_fd(-1);
 709
 710                         if (child != 0) {
 711                                 add_child_pid(child);
 712                         }
 713
 714                         /* Force parent to check log size after
 715                          * spawning child.  Fix from
 716                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 717                          * parent smbd will log to logserver.smb.  It
 718                          * writes only two messages for each child
 719                          * started/finished. But each child writes,
 720                          * say, 50 messages also in logserver.smb,
 721                          * begining with the debug_count of the
 722                          * parent, before the child opens its own log
 723                          * file logserver.client. In a worst case
 724                          * scenario the size of logserver.smb would be
 725                          * checked after about 50*50=2500 messages
 726                          * (ca. 100kb).
 727                          * */
 728                         force_check_log_size();
 729
 730                 } /* end for num */
 731         } /* end while 1 */
 732
 733 /* NOTREACHED   return True; */
 734 }
 735
 736 /****************************************************************************
 737  Reload printers
 738 **************************************************************************/
 739 void reload_printers(void)
 740 {
 741         int snum;
 742         int n_services = lp_numservices();
 743         int pnum = lp_servicenumber(PRINTERS_NAME);
 744         const char *pname;
 745
 746         pcap_cache_reload();
 747
 748         /* remove stale printers */
 749         for (snum = 0; snum < n_services; snum++) {
 750                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 751                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 752                                       lp_autoloaded(snum)))
 753                         continue;
 754
 755                 pname = lp_printername(snum);
 756                 if (!pcap_printername_ok(pname)) {
 757                         DEBUG(3, ("removing stale printer %s\n", pname));
 758
 759                         if (is_printer_published(NULL, snum, NULL))
 760                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 761                         del_a_printer(pname);
 762                         lp_killservice(snum);
 763                 }
 764         }
 765
 766         load_printers();
 767 }
 768
 769 /****************************************************************************
 770  Reload the services file.
 771 **************************************************************************/
 772
 773 bool reload_services(bool test)
 774 {
 775         bool ret;
 776
 777         if (lp_loaded()) {
 778                 char *fname = lp_configfile();
 779                 if (file_exist(fname, NULL) &&
 780                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 781                         set_dyn_CONFIGFILE(fname);
 782                         test = False;
 783                 }
 784         }
 785
 786         reopen_logs();
 787
 788         if (test && !lp_file_list_changed())
 789                 return(True);
 790
 791         lp_killunused(conn_snum_used);
 792
 793         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 794
 795         reload_printers();
 796
 797         /* perhaps the config filename is now set */
 798         if (!test)
 799                 reload_services(True);
 800
 801         reopen_logs();
 802
 803         load_interfaces();
 804
 805         if (smbd_server_fd() != -1) {
 806                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 807                 set_socket_options(smbd_server_fd(), lp_socket_options());
 808         }
 809
 810         mangle_reset_cache();
 811         reset_stat_cache();
 812
 813         /* this forces service parameters to be flushed */
 814         set_current_service(NULL,0,True);
 815
 816         return(ret);
 817 }
 818
 819 /****************************************************************************
 820  Exit the server.
 821 ****************************************************************************/
 822
 823 /* Reasons for shutting down a server process. */
 824 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 825
 826 static void exit_server_common(enum server_exit_reason how,
 827         const char *const reason) NORETURN_ATTRIBUTE;
 828
 829 static void exit_server_common(enum server_exit_reason how,
 830         const char *const reason)
 831 {
 832         static int firsttime=1;
 833
 834         if (!firsttime)
 835                 exit(0);
 836         firsttime = 0;
 837
 838         change_to_root_user();
 839
 840         if (negprot_global_auth_context) {
 841                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 842         }
 843
 844         conn_close_all();
 845
 846         invalidate_all_vuids();
 847
 848         /* 3 second timeout. */
 849         print_notify_send_messages(smbd_messaging_context(), 3);
 850
 851         /* delete our entry in the connections database. */
 852         yield_connection(NULL,"");
 853
 854         respond_to_all_remaining_local_messages();
 855
 856 #ifdef WITH_DFS
 857         if (dcelogin_atmost_once) {
 858                 dfs_unlogin();
 859         }
 860 #endif
 861
 862         locking_end();
 863         printing_end();
 864
 865         if (how != SERVER_EXIT_NORMAL) {
 866                 int oldlevel = DEBUGLEVEL;
 867
 868                 DEBUGLEVEL = 10;
 869
 870                 DEBUGSEP(0);
 871                 DEBUG(0,("Abnormal server exit: %s\n",
 872                         reason ? reason : "no explanation provided"));
 873                 DEBUGSEP(0);
 874
 875                 log_stack_trace();
 876
 877                 DEBUGLEVEL = oldlevel;
 878                 dump_core();
 879
 880         } else {
 881                 DEBUG(3,("Server exit (%s)\n",
 882                         (reason ? reason : "normal exit")));
 883         }
 884
 885         exit(0);
 886 }
 887
 888 void exit_server(const char *const explanation)
 889 {
 890         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 891 }
 892
 893 void exit_server_cleanly(const char *const explanation)
 894 {
 895         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 896 }
 897
 898 void exit_server_fault(void)
 899 {
 900         exit_server("critical server fault");
 901 }
 902
 903 /****************************************************************************
 904  Initialise connect, service and file structs.
 905 ****************************************************************************/
 906
 907 static bool init_structs(void )
 908 {
 909         /*
 910          * Set the machine NETBIOS name if not already
 911          * set from the config file.
 912          */
 913
 914         if (!init_names())
 915                 return False;
 916
 917         conn_init();
 918
 919         file_init();
 920
 921         /* for RPC pipes */
 922         init_rpc_pipe_hnd();
 923
 924         init_dptrs();
 925
 926         secrets_init();
 927
 928         return True;
 929 }
 930
 931 /*
 932  * Send keepalive packets to our client
 933  */
 934 static bool keepalive_fn(const struct timeval *now, void *private_data)
 935 {
 936         if (!send_keepalive(smbd_server_fd())) {
 937                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
 938                 return False;
 939         }
 940         return True;
 941 }
 942
 943 /*
 944  * Do the recurring check if we're idle
 945  */
 946 static bool deadtime_fn(const struct timeval *now, void *private_data)
 947 {
 948         if ((conn_num_open() == 0)
 949             || (conn_idle_all(now->tv_sec))) {
 950                 DEBUG( 2, ( "Closing idle connection\n" ) );
 951                 messaging_send(smbd_messaging_context(), procid_self(),
 952                                MSG_SHUTDOWN, &data_blob_null);
 953                 return False;
 954         }
 955
 956         return True;
 957 }
 958
 959
 960 /****************************************************************************
 961  main program.
 962 ****************************************************************************/
 963
 964 /* Declare prototype for build_options() to avoid having to run it through
 965    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 966    prototype generation system is too complicated. */
 967
 968 extern void build_options(bool screen);
 969
 970  int main(int argc,const char *argv[])
 971 {
 972         /* shall I run as a daemon */
 973         static bool is_daemon = False;
 974         static bool interactive = False;
 975         static bool Fork = True;
 976         static bool no_process_group = False;
 977         static bool log_stdout = False;
 978         static char *ports = NULL;
 979         static char *profile_level = NULL;
 980         int opt;
 981         poptContext pc;
 982         bool print_build_options = False;
 983         enum {
 984                 OPT_DAEMON = 1000,
 985                 OPT_INTERACTIVE,
 986                 OPT_FORK,
 987                 OPT_NO_PROCESS_GROUP,
 988                 OPT_LOG_STDOUT
 989         };
 990         struct poptOption long_options[] = {
 991         POPT_AUTOHELP
 992         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 993         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 994         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 995         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 996         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 997         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 998         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 999         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1000         POPT_COMMON_SAMBA
1001         POPT_COMMON_DYNCONFIG
1002         POPT_TABLEEND
1003         };
1004         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1005
1006         TimeInit();
1007
1008 #ifdef HAVE_SET_AUTH_PARAMETERS
1009         set_auth_parameters(argc,argv);
1010 #endif
1011
1012         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1013         while((opt = poptGetNextOpt(pc)) != -1) {
1014                 switch (opt)  {
1015                 case OPT_DAEMON:
1016                         is_daemon = true;
1017                         break;
1018                 case OPT_INTERACTIVE:
1019                         interactive = true;
1020                         break;
1021                 case OPT_FORK:
1022                         Fork = false;
1023                         break;
1024                 case OPT_NO_PROCESS_GROUP:
1025                         no_process_group = true;
1026                         break;
1027                 case OPT_LOG_STDOUT:
1028                         log_stdout = true;
1029                         break;
1030                 case 'b':
1031                         print_build_options = True;
1032                         break;
1033                 default:
1034                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1035                                   poptBadOption(pc, 0), poptStrerror(opt));
1036                         poptPrintUsage(pc, stderr, 0);
1037                         exit(1);
1038                 }
1039         }
1040         poptFreeContext(pc);
1041
1042         if (interactive) {
1043                 Fork = False;
1044                 log_stdout = True;
1045         }
1046
1047         setup_logging(argv[0],log_stdout);
1048
1049         if (print_build_options) {
1050                 build_options(True); /* Display output to screen as well as debug */
1051                 exit(0);
1052         }
1053
1054         load_case_tables();
1055
1056 #ifdef HAVE_SETLUID
1057         /* needed for SecureWare on SCO */
1058         setluid(0);
1059 #endif
1060
1061         sec_init();
1062
1063         set_remote_machine_name("smbd", False);
1064
1065         if (interactive && (DEBUGLEVEL >= 9)) {
1066                 talloc_enable_leak_report();
1067         }
1068
1069         if (log_stdout && Fork) {
1070                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1071                 exit(1);
1072         }
1073
1074         /* we want to re-seed early to prevent time delays causing
1075            client problems at a later date. (tridge) */
1076         generate_random_buffer(NULL, 0);
1077
1078         /* make absolutely sure we run as root - to handle cases where people
1079            are crazy enough to have it setuid */
1080
1081         gain_root_privilege();
1082         gain_root_group_privilege();
1083
1084         fault_setup((void (*)(void *))exit_server_fault);
1085         dump_core_setup("smbd");
1086
1087         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1088         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1089
1090         /* we are never interested in SIGPIPE */
1091         BlockSignals(True,SIGPIPE);
1092
1093 #if defined(SIGFPE)
1094         /* we are never interested in SIGFPE */
1095         BlockSignals(True,SIGFPE);
1096 #endif
1097
1098 #if defined(SIGUSR2)
1099         /* We are no longer interested in USR2 */
1100         BlockSignals(True,SIGUSR2);
1101 #endif
1102
1103         /* POSIX demands that signals are inherited. If the invoking process has
1104          * these signals masked, we will have problems, as we won't recieve them. */
1105         BlockSignals(False, SIGHUP);
1106         BlockSignals(False, SIGUSR1);
1107         BlockSignals(False, SIGTERM);
1108
1109         /* we want total control over the permissions on created files,
1110            so set our umask to 0 */
1111         umask(0);
1112
1113         init_sec_ctx();
1114
1115         reopen_logs();
1116
1117         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1118         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1119
1120         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1121                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1122
1123         /* Output the build options to the debug log */
1124         build_options(False);
1125
1126         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1127                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1128                 exit(1);
1129         }
1130
1131         /*
1132          * Do this before reload_services.
1133          */
1134
1135         if (!reload_services(False))
1136                 return(-1);
1137
1138         init_structs();
1139
1140 #ifdef WITH_PROFILE
1141         if (!profile_setup(smbd_messaging_context(), False)) {
1142                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1143                 return -1;
1144         }
1145         if (profile_level != NULL) {
1146                 int pl = atoi(profile_level);
1147                 struct server_id src;
1148
1149                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1150                 src.pid = getpid();
1151                 set_profile_level(pl, src);
1152         }
1153 #endif
1154
1155         DEBUG(3,( "loaded services\n"));
1156
1157         if (!is_daemon && !is_a_socket(0)) {
1158                 if (!interactive)
1159                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1160
1161                 /*
1162                  * Setting is_daemon here prevents us from eventually calling
1163                  * the open_sockets_inetd()
1164                  */
1165
1166                 is_daemon = True;
1167         }
1168
1169         if (is_daemon && !interactive) {
1170                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1171                 become_daemon(Fork, no_process_group);
1172         }
1173
1174 #if HAVE_SETPGID
1175         /*
1176          * If we're interactive we want to set our own process group for
1177          * signal management.
1178          */
1179         if (interactive && !no_process_group)
1180                 setpgid( (pid_t)0, (pid_t)0);
1181 #endif
1182
1183         if (!directory_exist(lp_lockdir(), NULL))
1184                 mkdir(lp_lockdir(), 0755);
1185
1186         if (is_daemon)
1187                 pidfile_create("smbd");
1188
1189         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1190
1191         if (smbd_messaging_context() == NULL)
1192                 exit(1);
1193
1194         if (smbd_memcache() == NULL) {
1195                 exit(1);
1196         }
1197
1198         memcache_set_global(smbd_memcache());
1199
1200         /* Initialise the password backed before the global_sam_sid
1201            to ensure that we fetch from ldap before we make a domain sid up */
1202
1203         if(!initialize_password_db(False, smbd_event_context()))
1204                 exit(1);
1205
1206         if (!secrets_init()) {
1207                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1208                 exit(1);
1209         }
1210
1211         if(!get_global_sam_sid()) {
1212                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1213                 exit(1);
1214         }
1215
1216         if (!session_init())
1217                 exit(1);
1218
1219         if (!connections_init(True))
1220                 exit(1);
1221
1222         if (!locking_init())
1223                 exit(1);
1224
1225         namecache_enable();
1226
1227         if (!init_registry())
1228                 exit(1);
1229
1230 #if 0
1231         if (!init_svcctl_db())
1232                 exit(1);
1233 #endif
1234
1235         if (!print_backend_init(smbd_messaging_context()))
1236                 exit(1);
1237
1238         if (!init_guest_info()) {
1239                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1240                 return -1;
1241         }
1242
1243         /* only start the background queue daemon if we are
1244            running as a daemon -- bad things will happen if
1245            smbd is launched via inetd and we fork a copy of
1246            ourselves here */
1247
1248         if ( is_daemon && !interactive )
1249                 start_background_queue();
1250
1251         /* Always attempt to initialize DMAPI. We will only use it later if
1252          * lp_dmapi_support is set on the share, but we need a single global
1253          * session to work with.
1254          */
1255         dmapi_init_session();
1256
1257         if (!open_sockets_smbd(is_daemon, interactive, ports))
1258                 exit(1);
1259
1260         /*
1261          * everything after this point is run after the fork()
1262          */
1263
1264         static_init_rpc;
1265
1266         init_modules();
1267
1268         /* Possibly reload the services file. Only worth doing in
1269          * daemon mode. In inetd mode, we know we only just loaded this.
1270          */
1271         if (is_daemon) {
1272                 reload_services(True);
1273         }
1274
1275         if (!init_account_policy()) {
1276                 DEBUG(0,("Could not open account policy tdb.\n"));
1277                 exit(1);
1278         }
1279
1280         if (*lp_rootdir()) {
1281                 if (sys_chroot(lp_rootdir()) == 0)
1282                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1283         }
1284
1285         /* Setup oplocks */
1286         if (!init_oplocks(smbd_messaging_context()))
1287                 exit(1);
1288
1289         /* Setup aio signal handler. */
1290         initialize_async_io_handler();
1291
1292         /*
1293          * For clustering, we need to re-init our ctdbd connection after the
1294          * fork
1295          */
1296         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1297                 exit(1);
1298
1299         /* register our message handlers */
1300         messaging_register(smbd_messaging_context(), NULL,
1301                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1302
1303         if ((lp_keepalive() != 0)
1304             && !(event_add_idle(smbd_event_context(), NULL,
1305                                 timeval_set(lp_keepalive(), 0),
1306                                 "keepalive", keepalive_fn,
1307                                 NULL))) {
1308                 DEBUG(0, ("Could not add keepalive event\n"));
1309                 exit(1);
1310         }
1311
1312         if (!(event_add_idle(smbd_event_context(), NULL,
1313                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1314                              "deadtime", deadtime_fn, NULL))) {
1315                 DEBUG(0, ("Could not add deadtime event\n"));
1316                 exit(1);
1317         }
1318
1319         TALLOC_FREE(frame);
1320
1321         smbd_process();
1322
1323         namecache_shutdown();
1324
1325         exit_server_cleanly(NULL);
1326         return(0);
1327 }